3.1.1 Working with Log Events

Data nodes and management servers regularly and on specific
occasions report on various log events that occur in the
cluster. These log events are written to the cluster log.
Optionally an MGM API client may listen to these events using
the method
ndb_mgm_listen_event(). Each
log event belongs to a category
ndb_mgm_event_category) and has
a severity
ndb_mgm_event_severity
associated with it. Each log event also has a level (0-15)
associated with it.